Direct observation of the (forbidden) S-1 state in carotenoids

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Direct observation of the (forbidden) S-1 state in carotenoids. / Polivka, Tomas; Herek, Jennifer; Zigmantas, Donatas; Åkerlund, Hans-Erik; Sundström, Villy.

In: Proceedings of the National Academy of Sciences, Vol. 96, No. 9, 1999, p. 4914-4917.

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TY - JOUR

T1 - Direct observation of the (forbidden) S-1 state in carotenoids

AU - Polivka, Tomas

AU - Herek, Jennifer

AU - Zigmantas, Donatas

AU - Åkerlund, Hans-Erik

AU - Sundström, Villy

N1 - The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Biochemistry and Structural Biology (S) (000006142), Chemical Physics (S) (011001060)

PY - 1999

Y1 - 1999

N2 - Carotenoids are involved in a variety of biological functions, yet the underlying mechanisms are poorly understood, in part because of the long-standing difficulty in assigning the location of the first excited (S-1) state. Here, we present a method for determining the energy of the forbidden S-1 state, on the basis of ultrafast spectroscopy of the short lived level. Femtosecond transient absorption spectra and kinetics of the S-1 --> S-2 transition revealed the location of the intermediate level in two carotenoid species involved in the xanthophyll cycle, zeaxanthin and violaxanthin, and yielded surprising implications regarding the mechanism of photoregulation in photosynthesis.

AB - Carotenoids are involved in a variety of biological functions, yet the underlying mechanisms are poorly understood, in part because of the long-standing difficulty in assigning the location of the first excited (S-1) state. Here, we present a method for determining the energy of the forbidden S-1 state, on the basis of ultrafast spectroscopy of the short lived level. Femtosecond transient absorption spectra and kinetics of the S-1 --> S-2 transition revealed the location of the intermediate level in two carotenoid species involved in the xanthophyll cycle, zeaxanthin and violaxanthin, and yielded surprising implications regarding the mechanism of photoregulation in photosynthesis.

KW - dependence

KW - photophysics

KW - fluorescence

KW - spectroscopy

KW - energy

KW - photosynthesis

KW - spheroidene

KW - dissipation

KW - xanthophyll cycle

KW - internal-conversion rate

M3 - Article

VL - 96

SP - 4914

EP - 4917

JO - Proceedings of the National Academy of Sciences

T2 - Proceedings of the National Academy of Sciences

JF - Proceedings of the National Academy of Sciences

SN - 1091-6490

IS - 9

ER -